Your windows can be one of the most inefficient points in your home, but they'll provide other benefits to offset this downside. You'll get to enjoy the view from various rooms as well as the natural sunlight that streams in during the day.

When your windows start showing signs of deterioration or other problems, you'll need to think about how to address the issue. Some damage can be repaired, but you may prefer a complete replacement of the window to upgrade its appearance and efficiency.

Unfortunately, replacing a window can be quite expensive. Charles Hooper, writing for Angie's List, says the cost typically ranges from $200 to $1,000 for each window. Jon Nunan, writing for the home improvement site RedBeacon, says the average cost to replace the windows in a home will often exceed $10,000.

Certain window issues can be addressed without incurring this expense. Kimberly Janeway, writing for Consumer Reports, says you can improve the efficiency of an older window by removing the old caulking or weather-stripping and replacing it with new components. Do this work on a day with low humidity and moderate temperatures; otherwise, fluctuations in the window may allow gaps to appear.

If the window is broken, it is often possible to repair it without getting a completely new window. Hooper says the process of reglazing lets you replace a glass pane.

Windows that are painted shut can be freed with a bit of effort. Janeway says a sash saw will be able to slice through the paint, leaving you with a window that can once again be opened.

Other issues can't be resolved quite so easily. Nunan says these problems include difficulties in opening or closing a window, noise transfer from outside the home, the failure of a seal, or the formation of condensation in double- or triple-paned windows.

Repairing a window also won't do much good if other components are in rough shape. The magazine Family Handyman says it is possible to replace rotted sashes and other wooden parts, but that it can be difficult and expensive to do so. Once rot sets in, it is easier to simply replace the window.

In older homes, the window may have lead paint on it. Janeway says replacing the window will remedy this problem. Since the removal process can create lead dust, you'll want to make sure anyone doing this work is protected against this risk.

When getting a replacement window, you'll want to consider many factors. Family Handyman says the style should blend in well with the rest of your home. You'll also want to consider how much maintenance the window will require to keep it clean and in good condition.

Upgrading a window provides you with the opportunity of improving your home's energy efficiency as well. Newer windows can prevent heat from escaping during the winter and keep cooling bills down by minimizing heat transfer during the summer.

Since it can be an expensive project, you might consider replacing windows in stages. Upgrading all of the windows on one side or floor will allow you to complete this work without a detrimental effect on the home's appearance.